diff --git a/contrib/editmerge b/contrib/editmerge
--- a/contrib/editmerge
+++ b/contrib/editmerge
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # A simple script for opening merge conflicts in the editor.
 # Use the following Mercurial settings to enable it.
 #
diff --git a/contrib/revsetbenchmarks.sh b/contrib/revsetbenchmarks.sh
--- a/contrib/revsetbenchmarks.sh
+++ b/contrib/revsetbenchmarks.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Measure the performance of a list of revsets against multiple revisions
 # defined by parameter. Checkout one by one and run perfrevset with every